A Brookings Institute study of census data showing that middle class neighborhoods are becoming more rare across the country. Between 1970 and 2000, lower-income families became more likely to live in lower-income neighborhoods, and higher-income families in higher-income neighborhoods.

Boston falls about in the middle of the pack in the ratings - approximately half our neighborhoods are middle income, 1/4 are very low or low income, and 1/4 are high or very high. The most stratified cities include New York, Los Angles, Miami, Houston, and Dallas. Minneapolis-St. Paul, Grand Rapids, and Salt Lake City have the largest middle class.